木質構造の耐震性能評価に与える変形速度と繰り返し加力の影響

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Strength of wood is affected by duration of load. Deformation of wood is affected by creep deformation. These features are called time-dependency on the performance of strength and deformation of wood. These time-dependencies of wood are considered to affect seismic performance of timber structures, because behavior of timber structures during earthquakes is dynamic. Performance of shear walls of timber structures has been evaluated by static or very slow loading tests. In order to analyze the effect of time-dependencies for the seismic performance of timber structures, monotonic and cyclic racking tests with static and some rates of deformation of nailed plywood shear walls for wood frame construction were executed. Pseudo-dynamic loading test using slow loading, shaking table test with real rate of response and embedding test of wood with some rates of embedding were also executed. Load-deformation curves were obtained from these tests. These test results clarified load-deformation curves in monotonic racking tests were affected by rates of deformation, and cyclic loadings decreased the effect of rate of deformation. Responses, load-deformation curves and failure modes by pseudodynamic test and shaking table test had some differences. These results suggest that the effect of rate of deformation changes failure modes of nailed-fasteners and load-deformation curves of these shear walls, and affects response and seismic performance of these structures. It is concluded that racking tests using some rates of deformation can produce more realistic and precise load deformation curves than that using static or very slow loadings for the analysis of seismic performance of timber structures. Rates of deformation for racking tests are proposed from these test results. The method to obtain damping factor for Voigt model is proposed. This damping factor is non-linear with deformation, and can express the effect of rate of deformation in equation of vibration using Voigt model. Finally, both tests of monotonic racking with rate of deformation and cyclic racking with static or rate of deformation are proposed in order to evaluate seismic performance of timber structures that would be affected by rate of deformation and cyclic loadings.
一般社団法人日本建築学会の論文
2006-03-20

木質構造の耐震性能評価に与える変形速度と繰り返し加力の影響

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